Refactor Japanese transforms

[khaitruong922]

update descriptions, add i18n for all forms, fix typo, etc.

rename all past keywords to -ta, reason: #1007

rename all romaji terms to Japanese

Fixes #1416

[codspeed-hq]

CodSpeed Performance Report

Merging #1413 will not alter performance

_{Comparing khaitruong922:update-ja-description (dd87214) with master (547a628)}

Summary

✅ 4 untouched benchmarks

🆕 1 new benchmarks
⁉️ 1 (👁 1) dropped benchmarks

Benchmarks breakdown

	Benchmark	master	khaitruong922:update-ja-description	Change
🆕	japanese transformations-full (n=212)	N/A	50.5 ms	N/A
👁	japanese transformations-full (n=214)	51.5 ms	N/A	N/A